Joely Richardson was recruited for the fourth season of The Tudors because of her international appeal, it has been claimed.

Earlier this week, it was reported that the London-born Nip/Tuck actress had signed up to play Catherine Parr on the Showtime drama series. Richardson is expected to appear in a five-episode arc when season four premieres in 2010.

A source told the Daily Express: "The Tudors is big in both the UK and US and Joely has the advantage of being well-known on both sides of the Atlantic.

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"It is a much sought-after part as the character plays a key role in the show's final events."

Show producers have already announced that the fourth run will be the last.